Please note that not every Playtech casino has a Flash version of Great Blue, and some bets limit your bet to $2.50. However, online casinos in the grid are in the download version of their casino and typically allow for bets of up to $12.50. When you download Playtech Casino, if you like the Great Blue slot, check out the Penguin Vacation and Irish Luck slots - these slots have the same free spin bonus as the Great Blue slot. In addition to the theme (obviously), the only real difference is the number of paylines. There are 25 Great Blues, 20 Penguin Vacations and 30 Irish Golds. Grand Blue is the highest of the three.